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Extract the contents of DUKEPLUS.RAR into a folder that contains an Atomic Edition copy of the file “DUKE3D.GRP” Double-click on the included dukeplus.bat OR, if you don't use the .bat: Launch the included EDuke32.exe. DO NOT click the Start button yet. Select the Game tab and then select DukePlus from the gamedir menu. Now click Start. The next time you launch EDuke32, Duke Plus will already be selected. To use the HRP with Duke Plus: Place “duke3d_hrp.zip” into a folder named “autoload” in your Eduke32 folder.

its hard to tell exactly what you did because your wording is vague. autoload folder method with which packages? unzipped/zipped - which ones & where?

from what you posted, it sounds like you could have extracted the hrp file into the autoload directory. the file should not have been extracted, the zip file itself should have been dropped into the autoload folder

there's also no mention of trying things out with the game launch menu, so it also sounds like you don't get a start window & that the game launches immediately after you click on the shortcut. (if you want the start menu you need to edit the eduke32.cfg file and change a line under setup to read ForceSetup = 1)